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Noncontrolling Interest - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2015
Variable Interest Entity, primary beneficiary Belden
Noncontrolling Interest [Line Items]
Additional contribution commitments to joint venture	$ 1,530
Hite
Noncontrolling Interest [Line Items]
Additional contribution commitments to joint venture	$ 1,470
Hite | Variable Interest Entity, primary beneficiary Belden
Noncontrolling Interest [Line Items]
Variable interest entity, ownership percentage		51.00%

X

- Definition

Additional contribution commitments to joint venture.

+ References

No definition available.

+ Details

Name:	bdc_AdditionalContributionCommitmentsToJointVenture
Namespace Prefix:	bdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=bdc_HiteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: